X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=avahi-core%2Frr.c;h=7fa0beebf610eb129b68e960be6f24c3d33549e9;hb=9c0f9c65093cfa53d45f9b68782321eb8063a032;hp=4ec3c11614dbb5c8b01b71f8f81fe1b83bfbb1d2;hpb=5ebf655c85076f200955458673a8bbf0dd927407;p=catta

diff --git a/avahi-core/rr.c b/avahi-core/rr.c
index 4ec3c11..7fa0bee 100644
--- a/avahi-core/rr.c
+++ b/avahi-core/rr.c
@@ -1,18 +1,16 @@
-/* $Id$ */
-
 /***
   This file is part of avahi.
- 
+
   avahi is free software; you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.
- 
+
   avahi is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
   Public License for more details.
- 
+
   You should have received a copy of the GNU Lesser General Public
   License along with avahi; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
@@ -28,104 +26,143 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
+#include <assert.h>
 
 #include <avahi-common/domain.h>
-#include "rr.h"
+#include <avahi-common/malloc.h>
+#include <avahi-common/defs.h>
 
-AvahiKey *avahi_key_new(const gchar *name, guint16 class, guint16 type) {
+#include "rr.h"
+#include "log.h"
+#include "util.h"
+#include "hashmap.h"
+#include "domain-util.h"
+#include "rr-util.h"
+#include "addr-util.h"
+
+AvahiKey *avahi_key_new(const char *name, uint16_t class, uint16_t type) {
     AvahiKey *k;
-    g_assert(name);
+    assert(name);
+
+    if (!(k = avahi_new(AvahiKey, 1))) {
+        avahi_log_error("avahi_new() failed.");
+        return NULL;
+    }
+
+    if (!(k->name = avahi_normalize_name_strdup(name))) {
+        avahi_log_error("avahi_normalize_name() failed.");
+        avahi_free(k);
+        return NULL;
+    }
 
-    k = g_new(AvahiKey, 1);
     k->ref = 1;
-    k->name = avahi_normalize_name(name);    
     k->clazz = class;
     k->type = type;
 
-/*     g_message("%p %% ref=1", k); */
-    
     return k;
 }
 
+AvahiKey *avahi_key_new_cname(AvahiKey *key) {
+    assert(key);
+
+    if (key->clazz != AVAHI_DNS_CLASS_IN)
+        return NULL;
+
+    if (key->type == AVAHI_DNS_TYPE_CNAME)
+        return NULL;
+
+    return avahi_key_new(key->name, key->clazz, AVAHI_DNS_TYPE_CNAME);
+}
+
 AvahiKey *avahi_key_ref(AvahiKey *k) {
-    g_assert(k);
-    g_assert(k->ref >= 1);
+    assert(k);
+    assert(k->ref >= 1);
 
     k->ref++;
 
-/*     g_message("%p ++ ref=%i", k, k->ref); */
-
     return k;
 }
 
 void avahi_key_unref(AvahiKey *k) {
-    g_assert(k);
-    g_assert(k->ref >= 1);
+    assert(k);
+    assert(k->ref >= 1);
 
-/*     g_message("%p -- ref=%i", k, k->ref-1); */
-    
     if ((--k->ref) <= 0) {
-        g_free(k->name);
-        g_free(k);
+        avahi_free(k->name);
+        avahi_free(k);
     }
 }
 
-AvahiRecord *avahi_record_new(AvahiKey *k, guint32 ttl) {
+AvahiRecord *avahi_record_new(AvahiKey *k, uint32_t ttl) {
     AvahiRecord *r;
-    
-    g_assert(k);
-    
-    r = g_new(AvahiRecord, 1);
+
+    assert(k);
+
+    if (!(r = avahi_new(AvahiRecord, 1))) {
+        avahi_log_error("avahi_new() failed.");
+        return NULL;
+    }
+
     r->ref = 1;
     r->key = avahi_key_ref(k);
 
     memset(&r->data, 0, sizeof(r->data));
 
-    r->ttl = ttl != (guint32) -1 ? ttl : AVAHI_DEFAULT_TTL;
+    r->ttl = ttl != (uint32_t) -1 ? ttl : AVAHI_DEFAULT_TTL;
 
     return r;
 }
 
-AvahiRecord *avahi_record_new_full(const gchar *name, guint16 class, guint16 type, guint32 ttl) {
+AvahiRecord *avahi_record_new_full(const char *name, uint16_t class, uint16_t type, uint32_t ttl) {
     AvahiRecord *r;
     AvahiKey *k;
 
-    g_assert(name);
-    
-    k = avahi_key_new(name, class, type);
+    assert(name);
+
+    if (!(k = avahi_key_new(name, class, type))) {
+        avahi_log_error("avahi_key_new() failed.");
+        return NULL;
+    }
+
     r = avahi_record_new(k, ttl);
     avahi_key_unref(k);
 
+    if (!r) {
+        avahi_log_error("avahi_record_new() failed.");
+        return NULL;
+    }
+
     return r;
 }
 
 AvahiRecord *avahi_record_ref(AvahiRecord *r) {
-    g_assert(r);
-    g_assert(r->ref >= 1);
+    assert(r);
+    assert(r->ref >= 1);
 
     r->ref++;
     return r;
 }
 
 void avahi_record_unref(AvahiRecord *r) {
-    g_assert(r);
-    g_assert(r->ref >= 1);
+    assert(r);
+    assert(r->ref >= 1);
 
     if ((--r->ref) <= 0) {
         switch (r->key->type) {
 
             case AVAHI_DNS_TYPE_SRV:
-                g_free(r->data.srv.name);
+                avahi_free(r->data.srv.name);
                 break;
 
             case AVAHI_DNS_TYPE_PTR:
             case AVAHI_DNS_TYPE_CNAME:
-                g_free(r->data.ptr.name);
+            case AVAHI_DNS_TYPE_NS:
+                avahi_free(r->data.ptr.name);
                 break;
 
             case AVAHI_DNS_TYPE_HINFO:
-                g_free(r->data.hinfo.cpu);
-                g_free(r->data.hinfo.os);
+                avahi_free(r->data.hinfo.cpu);
+                avahi_free(r->data.hinfo.os);
                 break;
 
             case AVAHI_DNS_TYPE_TXT:
@@ -135,18 +172,18 @@ void avahi_record_unref(AvahiRecord *r) {
             case AVAHI_DNS_TYPE_A:
             case AVAHI_DNS_TYPE_AAAA:
                 break;
-            
+
             default:
-                g_free(r->data.generic.data);
+                avahi_free(r->data.generic.data);
         }
-        
+
         avahi_key_unref(r->key);
-        g_free(r);
+        avahi_free(r);
     }
 }
 
-const gchar *avahi_dns_class_to_string(guint16 class) {
-    if (class & AVAHI_DNS_CACHE_FLUSH) 
+const char *avahi_dns_class_to_string(uint16_t class) {
+    if (class & AVAHI_DNS_CACHE_FLUSH)
         return "FLUSH";
 
     switch (class) {
@@ -159,7 +196,7 @@ const gchar *avahi_dns_class_to_string(guint16 class) {
     }
 }
 
-const gchar *avahi_dns_type_to_string(guint16 type) {
+const char *avahi_dns_type_to_string(uint16_t type) {
     switch (type) {
         case AVAHI_DNS_TYPE_CNAME:
             return "CNAME";
@@ -177,39 +214,56 @@ const gchar *avahi_dns_type_to_string(guint16 type) {
             return "SRV";
         case AVAHI_DNS_TYPE_ANY:
             return "ANY";
+        case AVAHI_DNS_TYPE_SOA:
+            return "SOA";
+        case AVAHI_DNS_TYPE_NS:
+            return "NS";
         default:
             return NULL;
     }
 }
 
-gchar *avahi_key_to_string(const AvahiKey *k) {
-    g_assert(k);
-    g_assert(k->ref >= 1);
-    
-    return g_strdup_printf("%s\t%s\t%s",
-                           k->name,
-                           avahi_dns_class_to_string(k->clazz),
-                           avahi_dns_type_to_string(k->type));
+char *avahi_key_to_string(const AvahiKey *k) {
+    char class[16], type[16];
+    const char *c, *t;
+
+    assert(k);
+    assert(k->ref >= 1);
+
+    /* According to RFC3597 */
+
+    if (!(c = avahi_dns_class_to_string(k->clazz))) {
+        snprintf(class, sizeof(class), "CLASS%u", k->clazz);
+        c = class;
+    }
+
+    if (!(t = avahi_dns_type_to_string(k->type))) {
+        snprintf(type, sizeof(type), "TYPE%u", k->type);
+        t = type;
+    }
+
+    return avahi_strdup_printf("%s\t%s\t%s", k->name, c, t);
 }
 
-gchar *avahi_record_to_string(const AvahiRecord *r) {
-    gchar *p, *s;
-    char buf[257], *t = NULL, *d = NULL;
+char *avahi_record_to_string(const AvahiRecord *r) {
+    char *p, *s;
+    char buf[1024], *t = NULL, *d = NULL;
+
+    assert(r);
+    assert(r->ref >= 1);
 
-    g_assert(r);
-    g_assert(r->ref >= 1);
-    
     switch (r->key->type) {
         case AVAHI_DNS_TYPE_A:
             inet_ntop(AF_INET, &r->data.a.address.address, t = buf, sizeof(buf));
             break;
-            
+
         case AVAHI_DNS_TYPE_AAAA:
             inet_ntop(AF_INET6, &r->data.aaaa.address.address, t = buf, sizeof(buf));
             break;
-            
+
         case AVAHI_DNS_TYPE_PTR:
-        case AVAHI_DNS_TYPE_CNAME :
+        case AVAHI_DNS_TYPE_CNAME:
+        case AVAHI_DNS_TYPE_NS:
 
             t = r->data.ptr.name;
             break;
@@ -232,77 +286,88 @@ gchar *avahi_record_to_string(const AvahiRecord *r) {
                      r->data.srv.name);
 
             break;
+
+        default: {
+
+            uint8_t *c;
+            uint16_t n;
+            int i;
+            char *e;
+
+            /* According to RFC3597 */
+
+            snprintf(t = buf, sizeof(buf), "\\# %u", r->data.generic.size);
+
+            e = strchr(t, 0);
+
+            for (c = r->data.generic.data, n = r->data.generic.size, i = 0;
+                 n > 0 && i < 20;
+                 c ++, n --, i++) {
+
+                sprintf(e, " %02X", *c);
+                e = strchr(e, 0);
+            }
+
+            break;
+        }
     }
 
     p = avahi_key_to_string(r->key);
-    s = g_strdup_printf("%s %s ; ttl=%u", p, t ? t : "<unparsable>", r->ttl);
-    g_free(p);
-    g_free(d);
-    
+    s = avahi_strdup_printf("%s %s ; ttl=%u", p, t, r->ttl);
+    avahi_free(p);
+    avahi_free(d);
+
     return s;
 }
 
-gboolean avahi_key_equal(const AvahiKey *a, const AvahiKey *b) {
-    g_assert(a);
-    g_assert(b);
+int avahi_key_equal(const AvahiKey *a, const AvahiKey *b) {
+    assert(a);
+    assert(b);
 
     if (a == b)
-        return TRUE;
-    
-/*     g_message("equal: %p %p", a, b); */
-    
+        return 1;
+
     return avahi_domain_equal(a->name, b->name) &&
         a->type == b->type &&
         a->clazz == b->clazz;
 }
 
-gboolean avahi_key_pattern_match(const AvahiKey *pattern, const AvahiKey *k) {
-    g_assert(pattern);
-    g_assert(k);
+int avahi_key_pattern_match(const AvahiKey *pattern, const AvahiKey *k) {
+    assert(pattern);
+    assert(k);
 
-/*     g_message("equal: %p %p", a, b); */
-
-    g_assert(!avahi_key_is_pattern(k));
+    assert(!avahi_key_is_pattern(k));
 
     if (pattern == k)
-        return TRUE;
-    
+        return 1;
+
     return avahi_domain_equal(pattern->name, k->name) &&
         (pattern->type == k->type || pattern->type == AVAHI_DNS_TYPE_ANY) &&
         (pattern->clazz == k->clazz || pattern->clazz == AVAHI_DNS_CLASS_ANY);
 }
 
-gboolean avahi_key_is_pattern(const AvahiKey *k) {
-    g_assert(k);
+int avahi_key_is_pattern(const AvahiKey *k) {
+    assert(k);
 
     return
         k->type == AVAHI_DNS_TYPE_ANY ||
         k->clazz == AVAHI_DNS_CLASS_ANY;
 }
 
-guint avahi_key_hash(const AvahiKey *k) {
-    g_assert(k);
+unsigned avahi_key_hash(const AvahiKey *k) {
+    assert(k);
 
     return
-        avahi_domain_hash(k->name) + 
+        avahi_domain_hash(k->name) +
         k->type +
         k->clazz;
 }
 
-static gboolean rdata_equal(const AvahiRecord *a, const AvahiRecord *b) {
-    g_assert(a);
-    g_assert(b);
-    g_assert(a->key->type == b->key->type);
-
-/*     t = avahi_record_to_string(a); */
-/*     g_message("comparing %s", t); */
-/*     g_free(t); */
+static int rdata_equal(const AvahiRecord *a, const AvahiRecord *b) {
+    assert(a);
+    assert(b);
+    assert(a->key->type == b->key->type);
 
-/*     t = avahi_record_to_string(b); */
-/*     g_message("and %s", t); */
-/*     g_free(t); */
-
-    
     switch (a->key->type) {
         case AVAHI_DNS_TYPE_SRV:
             return
@@ -313,6 +378,7 @@ static gboolean rdata_equal(const AvahiRecord *a, const AvahiRecord *b) {
 
         case AVAHI_DNS_TYPE_PTR:
         case AVAHI_DNS_TYPE_CNAME:
+        case AVAHI_DNS_TYPE_NS:
             return avahi_domain_equal(a->data.ptr.name, b->data.ptr.name);
 
         case AVAHI_DNS_TYPE_HINFO:
@@ -333,15 +399,15 @@ static gboolean rdata_equal(const AvahiRecord *a, const AvahiRecord *b) {
             return a->data.generic.size == b->data.generic.size &&
                 (a->data.generic.size == 0 || memcmp(a->data.generic.data, b->data.generic.data, a->data.generic.size) == 0);
     }
-    
+
 }
 
-gboolean avahi_record_equal_no_ttl(const AvahiRecord *a, const AvahiRecord *b) {
-    g_assert(a);
-    g_assert(b);
+int avahi_record_equal_no_ttl(const AvahiRecord *a, const AvahiRecord *b) {
+    assert(a);
+    assert(b);
 
     if (a == b)
-        return TRUE;
+        return 1;
 
     return
         avahi_key_equal(a->key, b->key) &&
@@ -352,7 +418,11 @@ gboolean avahi_record_equal_no_ttl(const AvahiRecord *a, const AvahiRecord *b) {
 AvahiRecord *avahi_record_copy(AvahiRecord *r) {
     AvahiRecord *copy;
 
-    copy = g_new(AvahiRecord, 1);
+    if (!(copy = avahi_new(AvahiRecord, 1))) {
+        avahi_log_error("avahi_new() failed.");
+        return NULL;
+    }
+
     copy->ref = 1;
     copy->key = avahi_key_ref(r->key);
     copy->ttl = r->ttl;
@@ -360,19 +430,27 @@ AvahiRecord *avahi_record_copy(AvahiRecord *r) {
     switch (r->key->type) {
         case AVAHI_DNS_TYPE_PTR:
         case AVAHI_DNS_TYPE_CNAME:
-            copy->data.ptr.name = g_strdup(r->data.ptr.name);
+        case AVAHI_DNS_TYPE_NS:
+            if (!(copy->data.ptr.name = avahi_strdup(r->data.ptr.name)))
+                goto fail;
             break;
 
         case AVAHI_DNS_TYPE_SRV:
             copy->data.srv.priority = r->data.srv.priority;
             copy->data.srv.weight = r->data.srv.weight;
             copy->data.srv.port = r->data.srv.port;
-            copy->data.srv.name = g_strdup(r->data.srv.name);
+            if (!(copy->data.srv.name = avahi_strdup(r->data.srv.name)))
+                goto fail;
             break;
 
         case AVAHI_DNS_TYPE_HINFO:
-            copy->data.hinfo.os = g_strdup(r->data.hinfo.os);
-            copy->data.hinfo.cpu = g_strdup(r->data.hinfo.cpu);
+            if (!(copy->data.hinfo.os = avahi_strdup(r->data.hinfo.os)))
+                goto fail;
+
+            if (!(copy->data.hinfo.cpu = avahi_strdup(r->data.hinfo.cpu))) {
+                avahi_free(r->data.hinfo.os);
+                goto fail;
+            }
             break;
 
         case AVAHI_DNS_TYPE_TXT:
@@ -388,31 +466,41 @@ AvahiRecord *avahi_record_copy(AvahiRecord *r) {
             break;
 
         default:
-            copy->data.generic.data = g_memdup(r->data.generic.data, r->data.generic.size);
+            if (!(copy->data.generic.data = avahi_memdup(r->data.generic.data, r->data.generic.size)))
+                goto fail;
             copy->data.generic.size = r->data.generic.size;
             break;
-                
+
     }
 
     return copy;
+
+fail:
+    avahi_log_error("Failed to allocate memory");
+
+    avahi_key_unref(copy->key);
+    avahi_free(copy);
+
+    return NULL;
 }
 
 
-guint avahi_key_get_estimate_size(AvahiKey *k) {
-    g_assert(k);
+size_t avahi_key_get_estimate_size(AvahiKey *k) {
+    assert(k);
 
     return strlen(k->name)+1+4;
 }
 
-guint avahi_record_get_estimate_size(AvahiRecord *r) {
-    guint n;
-    g_assert(r);
+size_t avahi_record_get_estimate_size(AvahiRecord *r) {
+    size_t n;
+    assert(r);
 
     n = avahi_key_get_estimate_size(r->key) + 4 + 2;
 
     switch (r->key->type) {
         case AVAHI_DNS_TYPE_PTR:
         case AVAHI_DNS_TYPE_CNAME:
+        case AVAHI_DNS_TYPE_NS:
             n += strlen(r->data.ptr.name) + 1;
             break;
 
@@ -443,12 +531,12 @@ guint avahi_record_get_estimate_size(AvahiRecord *r) {
     return n;
 }
 
-static gint lexicographical_memcmp(gconstpointer a, size_t al, gconstpointer b, size_t bl) {
+static int lexicographical_memcmp(const void* a, size_t al, const void* b, size_t bl) {
     size_t c;
-    gint ret;
-    
-    g_assert(a);
-    g_assert(b);
+    int ret;
+
+    assert(a);
+    assert(b);
 
     c = al < bl ? al : bl;
     if ((ret = memcmp(a, b, c)))
@@ -460,22 +548,22 @@ static gint lexicographical_memcmp(gconstpointer a, size_t al, gconstpointer b,
         return al == c ? 1 : -1;
 }
 
-static gint uint16_cmp(guint16 a, guint16 b) {
+static int uint16_cmp(uint16_t a, uint16_t b) {
     return a == b ? 0 : (a < b ? -1 : 1);
 }
 
-gint avahi_record_lexicographical_compare(AvahiRecord *a, AvahiRecord *b) {
-    gint r;
-/*      gchar *t1, *t2; */
+int avahi_record_lexicographical_compare(AvahiRecord *a, AvahiRecord *b) {
+    int r;
+/*      char *t1, *t2; */
 
-    g_assert(a);
-    g_assert(b);
+    assert(a);
+    assert(b);
 
 /*     t1 = avahi_record_to_string(a); */
 /*     t2 = avahi_record_to_string(b); */
 /*     g_message("lexicocmp: %s %s", t1, t2); */
-/*     g_free(t1); */
-/*     g_free(t2); */
+/*     avahi_free(t1); */
+/*     avahi_free(t2); */
 
     if (a == b)
         return 0;
@@ -488,6 +576,7 @@ gint avahi_record_lexicographical_compare(AvahiRecord *a, AvahiRecord *b) {
 
         case AVAHI_DNS_TYPE_PTR:
         case AVAHI_DNS_TYPE_CNAME:
+        case AVAHI_DNS_TYPE_NS:
             return avahi_binary_domain_cmp(a->data.ptr.name, b->data.ptr.name);
 
         case AVAHI_DNS_TYPE_SRV: {
@@ -495,7 +584,7 @@ gint avahi_record_lexicographical_compare(AvahiRecord *a, AvahiRecord *b) {
                 (r = uint16_cmp(a->data.srv.weight, b->data.srv.weight)) == 0 &&
                 (r = uint16_cmp(a->data.srv.port, b->data.srv.port)) == 0)
                 r = avahi_binary_domain_cmp(a->data.srv.name, b->data.srv.name);
-            
+
             return r;
         }
 
@@ -511,11 +600,20 @@ gint avahi_record_lexicographical_compare(AvahiRecord *a, AvahiRecord *b) {
 
         case AVAHI_DNS_TYPE_TXT: {
 
-            guint8 *ma, *mb;
-            guint asize, bsize;
+            uint8_t *ma = NULL, *mb = NULL;
+            size_t asize, bsize;
+
+            asize = avahi_string_list_serialize(a->data.txt.string_list, NULL, 0);
+            bsize = avahi_string_list_serialize(b->data.txt.string_list, NULL, 0);
+
+            if (asize > 0 && !(ma = avahi_new(uint8_t, asize)))
+                goto fail;
+
+            if (bsize > 0 && !(mb = avahi_new(uint8_t, bsize))) {
+                avahi_free(ma);
+                goto fail;
+            }
 
-            ma = g_new(guint8, asize = avahi_string_list_serialize(a->data.txt.string_list, NULL, 0));
-            mb = g_new(guint8, bsize = avahi_string_list_serialize(b->data.txt.string_list, NULL, 0));
             avahi_string_list_serialize(a->data.txt.string_list, ma, asize);
             avahi_string_list_serialize(b->data.txt.string_list, mb, bsize);
 
@@ -527,13 +625,13 @@ gint avahi_record_lexicographical_compare(AvahiRecord *a, AvahiRecord *b) {
                 r = -1;
             else
                 r = 0;
-            
-            g_free(ma);
-            g_free(mb);
+
+            avahi_free(ma);
+            avahi_free(mb);
 
             return r;
         }
-        
+
         case AVAHI_DNS_TYPE_A:
             return memcmp(&a->data.a.address, &b->data.a.address, sizeof(AvahiIPv4Address));
 
@@ -544,57 +642,92 @@ gint avahi_record_lexicographical_compare(AvahiRecord *a, AvahiRecord *b) {
             return lexicographical_memcmp(a->data.generic.data, a->data.generic.size,
                                           b->data.generic.data, b->data.generic.size);
     }
-    
+
+
+fail:
+    avahi_log_error(__FILE__": Out of memory");
+    return -1; /* or whatever ... */
 }
 
-gboolean avahi_record_is_goodbye(AvahiRecord *r) {
-    g_assert(r);
+int avahi_record_is_goodbye(AvahiRecord *r) {
+    assert(r);
 
     return r->ttl == 0;
 }
 
-gboolean avahi_key_valid(AvahiKey *k) {
-    g_assert(k);
+int avahi_key_is_valid(AvahiKey *k) {
+    assert(k);
 
-    if (!avahi_valid_domain_name(k->name))
-        return FALSE;
-    
-    return TRUE;
+    if (!avahi_is_valid_domain_name(k->name))
+        return 0;
+
+    return 1;
 }
 
-gboolean avahi_record_valid(AvahiRecord *r) {
-    g_assert(r);
+int avahi_record_is_valid(AvahiRecord *r) {
+    assert(r);
 
-    if (!avahi_key_valid(r->key))
-        return FALSE;
+    if (!avahi_key_is_valid(r->key))
+        return 0;
 
     switch (r->key->type) {
 
         case AVAHI_DNS_TYPE_PTR:
         case AVAHI_DNS_TYPE_CNAME:
-            return avahi_valid_domain_name(r->data.ptr.name);
+        case AVAHI_DNS_TYPE_NS:
+            return avahi_is_valid_domain_name(r->data.ptr.name);
 
         case AVAHI_DNS_TYPE_SRV:
-            return avahi_valid_domain_name(r->data.srv.name);
+            return avahi_is_valid_domain_name(r->data.srv.name);
 
         case AVAHI_DNS_TYPE_HINFO:
             return
                 strlen(r->data.hinfo.os) <= 255 &&
                 strlen(r->data.hinfo.cpu) <= 255;
 
-            
         case AVAHI_DNS_TYPE_TXT: {
 
             AvahiStringList *strlst;
 
             for (strlst = r->data.txt.string_list; strlst; strlst = strlst->next)
-                if (strlst->size > 255)
-                    return FALSE;
+                if (strlst->size > 255 || strlst->size <= 0)
+                    return 0;
 
-            return TRUE;
+            return 1;
         }
     }
-            
 
-    return TRUE;
+    return 1;
+}
+
+static AvahiAddress *get_address(const AvahiRecord *r, AvahiAddress *a) {
+    assert(r);
+
+    switch (r->key->type) {
+        case AVAHI_DNS_TYPE_A:
+            a->proto = AVAHI_PROTO_INET;
+            a->data.ipv4 = r->data.a.address;
+            break;
+
+        case AVAHI_DNS_TYPE_AAAA:
+            a->proto = AVAHI_PROTO_INET6;
+            a->data.ipv6 = r->data.aaaa.address;
+            break;
+
+        default:
+            return NULL;
+    }
+
+    return a;
+}
+
+int avahi_record_is_link_local_address(const AvahiRecord *r) {
+    AvahiAddress a;
+
+    assert(r);
+
+    if (!get_address(r, &a))
+        return 0;
+
+    return avahi_address_is_link_local(&a);
 }